I need a little help guys... I'm following the rebuild instructions in the manual for my 2012 Arctic Cat f800. I got to the step where you remove the nitrogen from the shock. When I started to loosen the set screw I could hear the gas escaping the shock. When I removed the set screw the black rubber plug that the needle goes through to fill the shock just shot out onto the bench. I'm not sure why it came out? It appears one end of the plug is slightly larger then the other. Does it matter what end faces out? And what keeps the plug in the shock while you begin to add nitrogen back into the shock? Won't it just shoot out again?